Patent Pending

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[1] Rules

[2] Spanish Patents

[3] Dornier Patents

[4] Daimler-Benz Strange Airplane of 1943-1950

[5] Otto Muck Tailsitter Patent 1938

[6] Frank M. Bellanca Odd Airplanes

[7] Sikorsky aircraft

[8] Boeing Patents

[9] Some VTOL & STOL Old Airplanes,From Little Known Designers

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